Electric-arc laivlp



(Model.)

2 Sheets-Sheet. l.

O. J. VAN DEPOELE.

ELECTRIC ARC LAMP.

Patented Jan. 8, 1884.

[724/012 [1%. @MM kilfiw mh 2 Sheets-Sheet 2.

Patented Jan. 8, 1884.

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ELECTRIC ARG LAMP.

(Model.)

CHARLES J. VAN DEPOELE, OF CHICAGO, ILLINOIS.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No, 291,553, dated January 8, 1884,

Application filed July 23, 1383. (llodeld To all whom, it may concern Be it known that I, OrmRLns J. VAN Dn- POELE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in an Electric-Arc Lamp 5 and I do hereby declare that the following is a full, clear, and exact description of the invention, reference being had to the accompanying drawings which form a part of this specification.

My invention relates to new and useful improvements in electric-arc lamps; and it consists in a mode of feeding down the carbons in such lamps, as herein described, whenever the carbons are separated at the moment of starting the lights. This improvement applies specially to lamps wherein an electric motor is used to produce the feed of the carbons. I have heretofore applied for Letters Patent in two cases, which cases I have called, respectively, A and B. Case Awas filed May 28, 1883, Serial No. 95,910, and case B June 18, 1883, Serial No. 98,525. The present case is marked C, and the lamp described is substantially similar to the one described in case B, except that the revolving armature is provided with an auxiliary coil which is in circuit whenever the carbons do not touch at the moment of starting the lamp, and it assists the shunt-coil to produce rotation of the revolving armature in a direction which will bring the previouslyseparated carbons together.

The following is a description of my improvement, reference being had to the annexed drawings, forming part of this specification.

Figure l is a side elevation, partly in section, through the center of lamp, showing the different parts of the lamp mechanism and connections. Fig. 2 is a plan view of the lamp, showing the annular field-magnet, its rotating .armature, and contact-brushes. Fig. 8 is a diagram, showing the connections and circuits through the different parts of the lamp. Fig. 4. is a diagrammatic view, showing the commutators and the circuits therefrom to the different coils. Fig. 5 is a detail view of one of the commutators and its contact-brush.

Similar letters denote like parts.

P and N are the positive and negative binding-posts of lamp,

M is an electro-magnet, the coils of which are in the main circuit between the lower carbon and the negative bindingpost, through conductor 6. From H the current passes over to N by conductor a. The end pieces of M are made of non-conducting substaneesuch as vulcanized fiberand on the top part of said ends are secured, to one a post, S, while to the other end is secured a post, j, having an extended arm to hold an iron armature, i. Said armature is pressed against the screw at post a by means of a spring, S, the tension of which can be modified by screw S in post S. The post j is connected to negative pole N by means of conductor a, so that when no current is circulating through BI the armature i will be in contact with the screw in a, and when the current is circulating through M contact is broken with n, the current now passing through the carbons of lamp.

A B C are commutators or rings of copper, upon which the brushes (a Z) c are pressing, giving passage to the current to the different circuits operating the lamp. The binding-post P is provided with abrush-holder, 1), projecting downward and insulated from top part of lamp. 19 carries a brush, 0, pressing upon commutator O, which is in contact with 'r, and 0' is in contact with the contact-brush o. r presses upon the contacts a a a, &c. The current passes in here and out on opposite side of the annular field-n1agnet at contacts a a a, 820., by contaetbrush e, which is in metallic contact with all positive parts of lamp. The post N is provided witha brush-holder, a, projecting downward and carrying a brush, 6, pressing upon commutator B. Said commutator is in communication with the shuntcoil,which is wound around the core of the revolving armature, the current entering at z from the iron core of the armature, coming out of one portion of said coil and being connected to the other half thereof at y, from whence it passes through said second portion, the extremity of same being connected permanently to the connnutator B by the wire .r. The third post a is also provided with a brushholder, at", all insulated from frame carrying the brush a, which presses upon A. From auxiliary coil A the current passes, by suitable conductor, 9, to the commutator A. This auxiliary coil passes from one end to the other of said armature by junction at 8. The outer extremity of said auxiliary circuit is permanently fixed to the metallic part of core at 7. This auxiliary coil is only in circuit whenever the lamp is to be started with the carbons not in contact, magnetizing the core of the armature, so that it will be repelled by its fieldmagnct. This causes the armature to turn lively in the direction to make the carbons meet; but as soon as this happens current passes in M, and the armature 43, being attracted to its core, cuts out the auxiliary coil, and the rotating armature, ceasing to be an electro-magnet, is acted upon as a piece of soft iron, and turns in opposite direction from at first, separating the carbons and producing the arc. As soon, however, as the arc is of proper length, current enough circulates through the shunt around the revolving armature to produce in the core thereof poles of like name to the corresponding ones in the annular field-magnet, which then repels instead of attracting said armature, and opposes any undue separation of the carbons thereby. In the present case the revolving armature acts upon a worm-wheel, L, actuating an endless band, (not shown,) to which the carbon is attached.

. p is a resistance that allows part of the current to go directly to the positive carbon by the top frame of lamp, while the other part is circulating through the coils of the annular field-magnet.

The circuits in the lamp are as follows: When both carbons are in contact, on establishing the current the current enters the positive pole P at 1, passes by brush-holder p to brush 0, to commutator C, to brush 1;, by r, to coils in annular field-magnet, in on one side and out on opposite side, by brush 1;, which is in contact with crossbar I and top part of lampframe. To brush-holderp, at 2, is fastened one terminal of a resistance, 19, the other terminal being screwed to the post L, allowing part of the current to pass directly to positive carbon by the metallic parts of the top frame, and the worm and worm-wheel, and a suitable metallic band, (not shown,) to which the carbon may be attached. The current from top frame passes over to positive carbon, and from positive to negative carbon, and thence by suitable conductor e to the coil in M, and by e to N, or negative pole of lamp. The shunt circuit around the revolving armature has one terminal connected permanently to its core at 2, which is in metallic contact with all positive parts of the lamp, the other end, coming out at :0, is connected to B, and by b to negative pole of lamp. 7

The circuit of the auxiliary coil is as follows: From positive part of lamp at core of revolving armature at 7, through coils, out at 9 to commutator A, to n, by a to n, and from a to hinged armature z, to post j, and by w to negative 'pole of lamp. Thus it will be seen that whenever the lamp is started and the carbons are not in contact, no current will be circulating through the coils of M. Consequently, 1' remains in contact with n and closes the circuit through the annular field-magnet and. the auxiliary coil of the revolving armature, and the wires and connections are so disposed as to produce a rotary motion in the revolving armature, which will effect the meeting of the carbons but the instant this takes place current passes in M and its core will attract and break the circuit of the auxiliary coil. The revolving armature will revolve in the opposite direction and separate the carbons, thus producing the are, and keep feeding as fast as the carbons are consumed, as explained in the previous applications referred to. The auxiliary circuit is not only used to produce magnetism in the rotating armature and cause the same to revolve, but also, by reason of its comparatively low resistance, it prevents injury by excessive heating or burning of the shunt-coils in connection with which it is used.

The main feature of this application is to provide the revolving armature with a coil which will cause the carbons to meet by the motion of said armature on starting the light. As will be understood, this lamp, not feeding by gravity, will leave its carbons apart every time the lamps are stopped or turned off, so that whenever it becomes necessary to. again start the light the carbons have to be brought in contact first before the arc can be formed, and this the auxiliary coil around the revolving armature is intended to effect. The shuntcoil around the armature would do this by using a resistance, as explained in case B; but

I find it sometimes desirable to omit the resistance and replace the same by the auxiliary coil. The action is positive and sure to make the carbons meet. IVhen this happens, as above described, M magnetizes its core and cuts the auxiliary coil out,wl1en the lamp will begin to work normally.

I do not claim in the present application any of the subj ect-matter covered by the claims in Case A, filed May 23, 1883, Serial No. 95,910, or in case B, filed June 18, 1883, Serial No. 98,525.

Having described my invention, I claim 1. In an electric-arc lamp in which the carbons are made to approach and recede from each other by the action of an electric motor, an auxiliary coil of comparatively low resistance placed on the revolving armature there of, and so wound and connected that on starting the light it will receive a portion of the main circuit, and cause said armature to rotate until the carbons have met, and means for then automatically cutting said auxiliary coil or coils out of circuit, when the lamp will begin to work normally, substantially as described.

2. An electric lamp in which the carbons are made to approach and recede by the action of an electric motor provided with coils for magnetizing the rotating armature thereof, which are included in a shunt around the arc, in combination with the ordinary mechanism and circuits thereof, as described, and an auxiliary coil around the revolving armature in addition to the shunt-coil already wound thereon, connections whereby the auxiliary coil is placed in the main circuit whenever the carbons in said lamp do not meet at the starting of the light, which will cause said revolving armature to rotate in such direction as to make the carbons come together, and means for cutting the auxiliary coil out of circuit as soon as this has been effected, when the current will pass through and between the carbons, substantially as described.

3. In an electric-arc lamp, the combination, with the feed mechanism thereof and a rotating armature wound with a shunt-circuit of high resistance, of an auxiliary circuit of comparatively low resistance also wound upon said armature, and so connected as to give passage to the main current when the same cannot pass through the carbons, thereby operating the feed mechanism and bringing them together, and also,by reason of its greater conductivity, preventing injury to the shuntcircuit, substantially as set forth.

4. In an electric-arc lamp having positive or mechanicallyoperated carbon-feeding mechanism, and in which the carbons do not meet when the light is not in operation, an auxili- 

